Asteroids

2005HC4 help

Last update: 2025-03-28 16:24 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.071

Aphelion (Q)

3.564

Eccentricity (e)

0.961

Inclination (i)

8.5

deg

Orbit period (P)

895.0

Earth MOID

0.05921

U parameter

9.0

Next Earth close approach

Date

2032-05-03

Nominal distance (from Earth center)

0.12221

18281713

Maximum Brightness

18.4

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

20.6

mag

Diameter

200 - 400*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2005-04-30

Observatory

Lowell Observatory-LONEOS

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.817535

1-sigma variation

0.028518

Unit

Eccentricity (e)

Value

0.961094

1-sigma variation

0.001161

Unit

Inclination (i)

Value

8.5486

1-sigma variation

0.0954

Unit

Long. of Ascending Node (Ω)

Value

62.3718

1-sigma variation

1.0847

Unit

Arg. of Perihelion (ω)

Value

310.4286

1-sigma variation

1.2446

Unit

Mean Anomaly (M)

Value

37.48334

1-sigma variation

60.73190

Unit

Perihelion distance

Value

0.070712

1-sigma variation

Unit

Aphelion distance

Value

3.564359

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.901917

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.644000

1-sigma variation

Unit

MOID

Value

0.059208

1-sigma variation

Unit

Orbit Period

Value

894.9994

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.13248E-4	3.31193E-5	2.71972E-3	-3.09323E-2	3.54925E-2	-1.73192E0
e	3.31193E-5	1.34880E-6	1.10759E-4	-1.25971E-3	1.44543E-3	-7.05321E-2
i	2.71972E-3	1.10759E-4	9.09593E-3	-1.03448E-1	1.18698E-1	-5.79201E0
Ω	-3.09323E-2	-1.25971E-3	-1.03448E-1	1.17653E0	-1.34998E0	6.58745E1
ω	3.54925E-2	1.44543E-3	1.18698E-1	-1.34998E0	1.54900E0	-7.55861E1
M	-1.73192E0	-7.05321E-2	-5.79201E0	6.58745E1	-7.55861E1	3.68836E3

Date of computation: 2025-02-19 13:28 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.625

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

200 - 400*

Unit

Source

[2]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

7261

Unit

Source

[1]

Normalized RMS of residuals

Value

0.622681

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2005-04-30.31003

Unit

Source

[2]

Last Observation

Value

2005-05-11.92802

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

53 (1)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Close Approaches for 2005HC4 from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1956-04-26 00:37	> 1 mo	0.0958950	0.0686741	2.0335632
MERCURY	1971-02-01 02:40	> 1 mo	0.0410545	0.0188305	3.0378501
MERCURY	1990-10-04 18:46	> 1 mo	0.0298987	0.0057599	2.6198791
EARTH	1998-03-09 05:39	> 1 w	0.1512337	0.1407308	0.2425676
MERCURY	2010-05-04 21:45	> 1 w	0.0163616	0.0162975	0.0521436
EARTH	2025-03-05 22:40	> 1 mo	0.1453349	0.1432739	0.3798932
EARTH	2032-05-03 21:40	> 1 mo	0.1222057	0.0578993	2.8069171
MERCURY	2044-09-15 12:08	> 1 mo	0.0489324	0.0102833	8.8816251
MERCURY	2052-01-03 04:32	> 1 mo	0.0147707	0.0122898	3.7137450
EARTH	2059-04-23 01:43	> 1 mo	0.1756436	0.0544253	4.9289260
EARTH	2074-03-08 08:54	> 1 mo	0.1507802	0.1488690	0.9136291
EARTH	2081-05-06 16:09	> 1 mo	0.1673599	0.0519725	5.6270539
MERCURY	2086-05-17 03:30	> 1 mo	0.0479611	0.0122009	11.5737761
MERCURY	2093-09-04 16:04	> 1 mo	0.0415006	0.0091799	7.3552065
EARTH	2108-04-30 15:11	> 1 mo	0.0494763	0.0483242	0.7181583
VENUS	2110-10-25 05:08	> 1 mo	0.0206673	0.0000505	3.9532847
VENUS	2113-04-10 09:40	> 1 mo	0.0030763	0.0015881	0.8772793
VENUS	2115-09-27 12:13	> 1 mo	0.0383693	0.0015817	16.8843128

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
297.80259091	116.57187047	0.05928699	MINIMUM
61.46625532	63.55602974	0.14324361	MINIMUM
356.06948864	256.66585816	0.93143601	SADDLE
356.11561240	76.90587426	1.06774000	SADDLE
179.85197739	90.96254293	2.57420210	SADDLE
179.96126861	270.97811774	4.55931362	MAXIMUM

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MOID Plots

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